5/3/2023 0 Comments CrackmeThe second TLS callback routine at first probably looks like that: 00401E76 push (offset loc_401E7F+1)Ġ0401E7F -Ġ0401E82. Trick 3: Anti-Disassembly with Fake Jumps and Garbage Bytes Trick 2: Dynamically Added TLS CallbacksĪll the first TLS callback does is create another TLS callback: 00401EC7 TlsCallback_0 proc nearĠ0401EC7 mov dword_404020, offset loc_401E76Īdd a breakpoint at loc_401E76 and run there. Make sure you have set a breakpoint at the TlsCallback_0 offset, or that the debugger is set to stop at TLS callbacks. data:0040401C TlsCallbacks dd offset TlsCallback_0 data:0040400C TlsCallbacks_ptr dd offset TlsCallbacks Those are invoked before the main entry point. Part 1: Anti-Debugging Measures Trick 1: TLS Callbacks No anti-debugging scripts have been used - all tricks have been manually defused. I used IDA Pro and WinDBG to solve the crackme. The second part then validates the key file that you provide. The first part is all about trying to stop you from getting to the relevant code by throwing a handful of anti-debugging and anti-disassembly techniques at you. The crackme is written in Assembler and runs on Windows. It is rated at 4 - Needs special knowledge. The crackme Matteo KeygenMe by Matteo has been published February 24, 2015.
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